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Subjects I'm working on

• Wikipedia:Writing better articles
• Help:Wikitext
• Help:Displaying_a_formula

Help:Displaying a formula

{{note_label|Wood1992||}}

$dU=\backslash underbrace\{\backslash delta\; Q\}\_\{\backslash delta\; Q\}\; +\; \backslash underbrace\{\backslash delta\; W\_\{irr\}+\backslash delta\; W\_\{rev\}\}\_\{\backslash delta\; W\}$

$dU=\backslash underbrace\{\backslash delta\; Q\; +\; \backslash delta\; W\_\{irr\}\}\_\{T\backslash ,dS\}+\backslash underbrace\{\backslash delta\; W\_\{rev\}\}\_\{-P\backslash ,dV\}$

• References {{note_label|Wood1992||}} {{ref_harvard|Wood1992|Wood, 1992|}}
• References reference,,,{{rp|p.103}}
• References (Harvard with pages)

{{harvnb|Rybicki|Lightman|1979|p=22}}

==References==

{{Reflist|# of columns}}

=== Bibliography ===

{{ref begin}}

*{{Cite book|etc |ref=harv}}

{{ref end}}

• Template:Cite_web
• Template:Cite_journal
• Template:cite book{{cite journal |last1=Herrmann |first1=F. |last2=Würfel |first2=P.|year=2005 |title=Light with nonzero chemical potential |journal=Am. J. Phys |volume=78 |issue=3 |pages=717-721 |publisher=American Association of Physics Teachers |doi=10.1119/1.1904623 |url=https://www.google.com/#hl=en&tbo=d&sclient=psy-ab&q=Herrmann+%22Light+with+nonzero+chemical+potential%22&oq=Herrmann+%22Light+with+nonzero+chemical+potential%22&gs_l=hp.3...227562.227562.1.228017.1.1.0.0.0.0.0.0..0.0.les%3Bcpsugrpq2high..0.0...1.vSu9w3P37vw&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.1355534169,d.eWU&fp=5d1955e51bd5f1c6&bpcl=40096503&biw=1638&bih=807 |accessdate=2012-12-20}} A necessary condition for Planck's law to hold is that the photon number is not conserved, implying that the chemical potential of the photons is zero. While this may be unavoidably true on very long timescales, there are many practical cases that are dealt with by assuming a nonzero chemical potential, which yields an equilibrium distribution which is not Planckian.

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